US2075740A

US2075740A - Duplex valve

Info

Publication number: US2075740A
Application number: US717697A
Authority: US
Inventors: William F Mckay
Original assignee: Union Carbide and Carbon Corp
Current assignee: Union Carbide Corp
Priority date: 1934-03-28
Filing date: 1934-03-28
Publication date: 1937-03-30
Anticipated expiration: 1954-03-30

Description

March 30, 1937. Y w. F. MCKAY 2 ,07g40 l n DUPLEX VALVE Filed March 28, 1954 Patented Mar. .30, 1937 A DUPLEX VALVE William F. McKay, Maplewood, N. J., assigner, by f mesne assignments, to Union Carbide and Car` bon Corporation, a, corporation oi New York Application Marchas, 1934, serial No. 717,697

1s clams. (cian-1s) I This invention relates to improvements. in

valves andv more particularly .to an improved-- duplex valvefor controlling the flow of fluid from separate sources to a common discharge conduit or Afrom 'a single supply conduit to separate de- 'livery conduits. l

The main objects of4 this invention/are: topro- 1 vide an improved valve of the packless type; to provide a conveniently-operable, compactandv b simple duplex valve for controlling the iiow of 1 rluidfrom branch conduits toa single conduitor vice versa; and to provide a duplex valve in which the valves may be operated independently, in which'each valve may be closed positively rather 15,than by the action ofia springalone, in which. "both valves may bev closed simultaneously,.and

in which one of the valves may -be opened -while `the other valve is maintained in av closed position.

These and'other objects and the novel fea-.

tures ofthis invention will become apparent `from the following' description and the accompanying drawing, of` which: i

Fig'.` l is a longitudinal cross-sectional view of `a duplex valve embodying this invention;

Fig. 2 is arr end view of thevalve; and `Fig.`3 is a transverse sectionalview of one of the-valve heads, taken on the line 3--3 in Fig. 1. One embodiment of this invention, as shown by the drawing, comprises a metal valve body A whichhas two axially-aligned, substantially iden- Y tical cavities B and C, and. a" cylindrical bore D providing a chamber E between and axially in line vwith said cavities.. The chamber E communicates through ports P,`P with chambers andF" in said cavities, and said ports are controlled by valves'i/, V` mainly l,housed in the` chamber E andoperable by mechanisms'located in saidv cavities. Branch passages G, G and a single passage H in the body 'A, respectively operiV into the end chambersv F, F' and into the intermediate chamber E,-these` passages being adapt- `ed for the connection thereto of suitable conduitsl so that fluid may be delivered at will from either`r P is disposedlcentrally in a part ofthe body con'- stituting a partition between the chamber `E and ,the cavityB, and the port P' is disposed centrally ina threaded ring R secured in an internally' threaded section lI 0 at the bottom of the cavity C. A gasket II, held against a shoulder I2 by the` ringljR, seals the joint between the body andthe ring. Recesses I3 in the face of the ring R xnay f be provided to receive a wrench or other suitable ltool for tightening the ring into place.

The valves V, V are identical butface in opposite, directions in the chamber Eiand preferably have bevelled surfaces adapted to engage corre--` spondingly bevelled seatsat the ports P, P'. kThe valves have. stems I4, Il' which extend through the ports into the chambers F and Ff respectively, and the valve heads are slidable within and guided bythe bore D but are flattened or partially cut away at opposite sides, as at I5, I5', to permit'the flow ofiiuid past the valves. Back of their heads, the valves have reducedsections or bosses I6, I6 i which are encircled by `asingle stiff helical spring; Spthe 'opposite ends of which bearaag'alnst the 1 shoulders I8, I8' formed between the valve heads l and said bosses. 1 t The valve operating mechanismsin the cavij ties B and C are identicall and, to simplify the description, only the mechanism in cavity B willv lbe described in detail, like parte in the other cavity being designated bythe same rnumerals primed. The entrance of the cavity Bis internally threaded, `as at` I9, to receive the externally threaded bushing 20,' lthe inner annular., end of `which engages the margin ,of an imperforate. ilexible circular metal diaphragm 2I and clamps the latter fluid tight against an internal shoulder 2,2. The diaphragm 2l (or ZIf) thus serves as one wall of thechamber B (or,C) rand, being flexible, also constitutespan `element for transmitting pressure to operatethe valve V (or V'). 'Ihe central portion of the inner face of the diaphragm is engageable bythe convex face of a pressure transmitting plate., 23, the opposite face of which hasa recess 24 to receive the rounded end of the valve stern Il .whereby the latter and the plate 23 are self-centering.` The, central portion of the outer face of the diaphragm 2i engages lthe convex surface offa second pressure-transmitting plate 25.4 The plate 25 maybel of larger diameter thanthe plate 23 to support the diaphragm 2| when-it is exed outwardly or inwardly. 1 The plate y"|25 iits within and preferably has a peripheral surface of about the same diameter as a counterbore-"ZB` at the inner end of the bushing 20, so that'the plate will be slidable in and guided by ltheeounter- Ore y b Y f 'I'.he bushingZU is internally threaded, `as atZV'I, toreceive an externally threaded valve-actuating plug 28 which is rotatable and axially adjustable in the bushing to either unseat or release` the valveV. The pressure exerted by adjustment of the plug is applied to the plate 2.5 by a spheri- T, Vori-ICE cal or ball bearing 29 which seats in correspondingly shaped

recesses

30, 3| in the opposed faces of the plug 28 and plate 25 and provides a slight clearance between these parts.

5 The bushing 20 is lalso counterbored between its internally-threaded section 21 and the counterbore 26 to provide a chamfered shoulder` 32 which serves as a sealing seat for the edge of an annular I tion or key 34 to fit a keyway 35 at the end of a handle 36 which is adapted to turn the plug in either direction and thereby advance or retract` the plug 28 in the bushing 20. In order that the two plugs 28 and 28' may be operated in unison to unseat one valve while closing the other, or

to set both valves in an intermediate closed position, the two

handles

36 and 36 may be bent toward one another and provided with matching hemispherical heads 31, 31' which are provided with aligned recesses, one of which is threaded,

to receive a set screw 38 to secure the heads together and forma ball-shaped grip.

Assuming that the valve V is open and the valve V' is closed, as shown; when the two handles are swung forward as a unit, the plug 28 will bev turned in a clockwise direction, viewed from the right side of the valve while the plug 28 will be turned in a counter-clockwise direction, as viewed from the opposite, or left, side of the valve. As

the handles are swung through an arc of substantially 90, pressure will be withdrawn from the valve V to permit it to seat over the port P under the force of the closing spring Il, while 40 the plug 28 and ball bearing 29' are advanced until initial contact is made with the plate 25. Both the valves V and V are closed When the handles are in this intermediate position, and no fluid can iiow through the passage H.

A further throw of the handles 36, 3'6 through another arc of substantially V90" will cause the plug 28 andball `bearing 29 to force the plate 25 against the diaphragm 2|', thrusting the plate 23 against the stem of valve V and moving the valve V away from its seat to an open position. At the same time the boss I6' of the valve V is moved across the chamber E Where it engages the boss I6 of the valve V and firmly and positively` seats the latter. V by a direct axial thrust gives greater assurance of a leak-tight fit of the valve V over the port P than if the compressive action of the spring S alone were relied upon. In service, the valve may be mounted so that the axial center line of the bore D and chambers F, F is either horizontal or vertical. When said axis is vertical, there is less possibility that the weight of the handles 36, 36' may accidentally change the setting of valves.

In the preferred construction of this valve, as 05 shown,`it is impossible for both valves to be open at the same time, since the spring S as well as the engagement of the bosses I6, and I'6' force and hold one valve shut when the other valve is opened. However, by shortening the bosses I6, I6' lso, that there will be a substantial clearance between them and by making the springs of suilicient strength, the handles 36 and 36' may be turned in opposite directions from their intermediate closed position to open both valves at the same time, where it is desired to simultane- The closing of the valve ously supply iluids from the branch passages G and G to the single passage'H or to supply fluid from the single passage H to the two branch passages. With the bosses thus shortened so that there is between them a clearance at least slightly greater than the aggregate length of travel-.of each of the valves, the handle 36 may be thrown throughan arc of approximately while the handle 36 remains in the position, as shown. Both of the valves will then be opened, and a complete reversal of the position of the handles is necessary to close the valves.

Although one embodiment of this invention has .y been illustrated and described, it will be understood that some parts of the improvedl valve may be used without others and various changes may be made in the construction disclosed without departing from the principles of this invention.

I claim:

l. A valve comprising a body having aligned cylindrical chambers and a coaxial port connectingsaid chambers; a valve in one of said chambers controlling saidport and having a stem projecting through said port into the other of said chambers, a bushing secured to said body in line with said chambers; an adjustable valveactuating element carried by said bushing; and means for transmitting pressure from said element to said valve stem comprising an imperforate diaphragm clamped to said body by said bushing and constituting a wall of the chamber into which said stem projects, the pressure-transmitting'means also comprising a pair oi plates, one of saidrplates being operatively associated with said valve stem and having a convex surface i thatengages one face of said diaphragm, and thev other platebeing operatively associated with said Y actuating element and having a convex surface that engages the other face of said diaphragm.

2. A Avalve comprising a cylindrical chambers and a coaxial port connect-` ing said chambers; a valve in one of said chambers controlling said port and having a stem projecting through said port into the other of said chambers, a bushing secured to said body in line with said l chambers; an adjustable valve-actuating element f carried by said bushing; and means for transmitting pressure from said element to said valve stem comprising an imperforate diaphragm clamped to.said body by said bushing and constituting a Wall of the chamber into which said stem projects, said bushing having a counterbore; and the pressure-transmitting means also comprising a pair of plates of unequal diameter, the smaller plate engaging one face of said diaphragm and being movably connected to said valve, the larger plate engaging the other face of said diaphragm and being guided by the wall of said counterbore.

3. A valve comprising a body having aligned cylindrical chambers and a coaxial portconnecting said chambers; a valve in one lof said chambers controlling said port and having a stem projectingV through said port into the other of said chambers, a bushing secured to said body in line with said chambers; an adjustable valve-actuating element carried by said bushing; and means for transmitting pressure from said elementI to said valve stem comprising an imperforate diaphragm clamped to said body by said bushing and constituting a wall of the chamber into which said stem projects, said actuating element being rotatable, and the pressure-transmitting means also comprising a non-rotating plate bearing against said diaphragm and substantially the dibody having aligned ,L

ameter of said outer chamber, and a ball bearing between said actuating element and said plate.

4. A valve comprising a body having aligned cylindrical chambers and a coaxial port connecting said chambers; a valve in one of said chambers controlling said port and having a stem projecting through said port into the other of said chambers, a bushing secured to said body in line with said chambers; an adjustable valve-actuating element carried by said bushing; and means for transmitting pressure from said element to said valve stem comprising -an imperforate diaphragm clamped to said body by said bushing and `constituting' a wall of the chamber into which said stem projects, saidactuating element being turnable and longitudinally adjustable in said bushing; and the pressure-transmitting means comprising a pair of plates, one of said plates being movably mounted on said valve stem and 20 having a convex surface engaging one face of said diaphragm, the other plate having avconvex surface engaging the other surface of substantially the entire movable portion `olf said diaphragm, said other plate and said actuating ele- \ment having opposed recesses, and a ball bearing seated in said recesses.

i 5. A valve comprising a body having aligned cylindrical chambers anda coaxial port connecting said chambers; a valve in one of said cham-V bers controlling said port and having a stem projecting through said port `into the other of said chambers, abushing secured to said body inline with said chambers; an adjustablejvalve-actuati ing element carried by said bushing; and means for transmitting pressure from said element to` said valve stem comprising an imperforate diaphragm clamped to said body by said bushing and constituting a Wall o1' the chamber into Whichy said Ystern projects, said bushinghaving a recess with a chamfered shoulder, and said valve-actuating element having a,` round cornered flange i adapted-to contact with said chamfered shoulder .to additionally seal the chamber having the valve therein when the valve is open.

6. A- duplex valve comprising a body having end chambers, a third chamberand ports conf necting said third chamber to said end chambers, said end chambers and third chamber being `axially aligned; valves controlling said ports; and means, swingableabout'the axis of said chambers, for operating said valves toA close either of said ports and open the other.v l f 7. A duplex valve comprising a body having end chambers, a third chamber, and ports connecting said third chamber to` said end chambers; valves controlling said ports; and means outside of said chambers for operating said .valves either simultaneously or independently.

8. A duplex valve comprisinga `body having end chambers, a third chamber,` and ports connecting said third chamber tosaid end chambers;-valves in said third chamber for controlling said ports; and `means comprising a diaphragm i for operating each oi' said valves. f

9. A duplex valve according to vclaim ,7, in

ythe other.

independently oi.' the other.

which said body` has iiuid passages severally opening into each of `said chambers, and said valves are operable to control the fluid iiow inA either direction through said passages.

10.'A duplex valve Vaccording to claim "l, in

f operating said valves either simultaneously or independently comprising va handle consisting of a two similar connectible parts.

12. A duplex valve comprising a body having endchambers, a third chamber, and-ports connecting said third chamber -to saidend chambers valves controlling saidports; and means foreperating said valves either simultaneously or independently comprising a handle consisting of two separable and connectible halves adapted to be4 operated independently to unseat either valve withoutV operating the other, and adapted to be operated as afunit to open either valve and close 13. A duplexgvalve,comprising a body having end chambers Ieacl'iprovided with a flexible wall. a third chamber axially` inline `with saidend chambers, and ports connecting said third chamber to said endifchambers; valvesv in said third chamber for controlling said ports; spring means in said third chamber tending to seat said valves and close said ports; and means in said 4end chamber-'sk operable by movement of said wall to unseat said]` valves. e

14..A duplex' valve'according'to claim 13, in which said port'sare located in the ends of `said third chamber each adjacent one of said ilexible walls, and said spring means comprises a single springfbearing against both va1`ves.

15. A duplex valve according to claim 13, in which said valves have heads whereby they are vguided airially in said third chamber, and said spring means VVcomprises a single spring encirf cling a portion of each valve.

16. A duplex valveaccording to claim 13, in combination with means for operating such unseating means to alternately unseat said valves and Vwith means whereby either valve is operable 17. A lduplex valveaccording to claim 13, in combination with meansfor moving said flexible walls for unseating one yvalve and simultaneously releasing the other to' permit said spring means to seat vthe latter.

18. A duplex valve according to claim '13," in f .n ,which said valves have heads slidable in said third chamber, in combination `with means for unseating one valve and for simultaneously releasing the other to permit said spring meansand the opposing 'valvevhead to seatf'the latter. f WILLIAMl F. MoKAY.